CN1206161A - Method and apparatus for correcting alignment error of scanning head of shuttle type scanner - Google Patents

Abstract

Disclosed are a method and an apparatus for correcting an alignment error of a scanning head of a shuttle type scanner capable of compensating for an error occurring in a manufacturing or an alignment error generated by an impact in use. When an alignment error correction mode is selected at a preset time, the scanning head is moved to a position facing a correction pattern formed on a correction plate. The correction pattern is scanned through the scanning head and the alignment error is calculated from the scanned pattern image data using a predetermined operation function. After performing a first correction to the calculated alignment error by moving first and last pixels of the image data, a second correction to the alignment error is performed by applying a preset correction function to remaining pixels excluding the first and last pixels.

Description

Be used to proofread and correct the alignment error machine noise detector of the scanner head of reciprocating type scanner

The present invention relates to a kind of method and apparatus that is used to proofread and correct the alignment error (alignmenterror) of reciprocating type scanner scans head, more particularly, the present invention relates to a kind of error that can compensate in manufacture process to be produced or in use by the method and apparatus of alignment error that is used to proofread and correct reciprocating type scanner scans head of the alignment error that impact produced that is applied.

Usually, the scanner head in reciprocating type scanner fully vertically is transported on the direction of carrying file.This expression alignment error is zero (0).In this case, image fault can not take place in the view data that this is scanned.

Yet, because manufacture process or other reasons can not produce a kind of product that does not perfectly have alignment error, so the scanner of having produced has at present been ignored the alignment error in allowing limit when it designs.Herein, the permission limit of alignment error changes along with the manufacturing of relevant product and each product.Set φ＜4 ° haply.Therefore, in a kind of product, if the alignment error of this product surpasses this limit, this product just is considered to substandard products, and this alignment error need mechanically be readjusted process.If alignment error is in this limit in a product, even produced alignment error, this error also can be left in the basket, and this product is available.

Yet, in common Reciprocatory scanner, be not used in the method for proofreading and correct alignment error with alignment error product in allowing limit.As a result, use this product continuously owing to ignored alignment error, so when the file to a kind of normal condition scans and print this view data that is scanned shown in Figure 1A like that, in this printed image, exist the problem of image fault.

Therefore, the purpose of this invention is to provide a kind of method, when using this Reciprocatory scanner to carry out scan operation, this method is used to proofread and correct the alignment error of the scanner head of Reciprocatory scanner, can obtain a kind of normal print state.

Another object of the present invention provides a kind of equipment, and this equipment is used to proofread and correct the alignment error of this reciprocating type scanner scans head.

According to an aspect of the present invention, when selecting a kind of alignment error correcting mode in the given time, this scanner head is moved to towards the position of formed correction graph on correction plate.Correction graph is scanned by scanner head, uses the scheduled operation function to calculate alignment error by the view data of the figure that has scanned.After first and final pixel by moving this view data carry out correction first time to the alignment error of this calculating, to the second-order correction of this alignment error be by given correction function is applied to got rid of this first and final pixel after remaining pixel realize above.

Alternatively when making this scanner, begin to carry out this scan operation, or when each is advanced line scanning operation, can set the correcting mode of alignment error.

Preferably, respectively on the direction that scanner head moves back and forth and on the reciprocating direction perpendicular to scanner head, the figure of this correction has the size (N is a positive number) of 1 * N pixel herein.At this moment, on the reciprocating direction perpendicular to scanner head, the size of correction graph is set to has identical number of picture elements on the Z-axis of this scanner head.

Alternatively this correction graph can be set at and have the optional color that can be scanned by this scanner head.Preferably, this correction graph has black color.

Preferably this handling function is: $\mathrm{\φ}={\tan }^{-1}\frac{D}{V}$ Wherein, φ is an error angle, and V is a number of picture elements total on this Z-axis, and D is the alignment error value of transverse axis.

Best, when carrying out the timing first time, the order according to the Z-axis location identical with first pixel moves this last pixel.

Best, this correction function is following differentiation function: $\frac{d}{\mathrm{dv}}\mathrm{dropD}=-V\×\tan \mathrm{\φ}$ Wherein, D is the alignment error value of transverse axis, and V is the number of total picture element on this Z-axis, and φ is an error angle.

According to a further aspect in the invention, the equipment of alignment error that is used to proofread and correct the scanner head of Reciprocatory scanner comprises: a correction plate, this correction plate is installed on the path that scanner head moves back and forth, this correction plate is towards this scanner head, and this correction plate comprises that also this correction graph of a kind of correction graph has a certain size and is formed in plate; A kind of storer that is used to store the graphic image data that scans by this scanner head; A kind of operating unit, this operating unit utilize the preset operation function to calculate the alignment error of this stored in this storer graphic image data; And a CPU (central processing unit), the to-and-fro movement of this this scanner head of central processing unit controls is controlled this operating unit so that calculate the alignment error of this graphic image data, and uses this correction function to proofread and correct the alignment error of this calculating.

Best, this correction plate is installed on the path that this scanner head moves back and forth, and is installed on the outer position of the scanning area of the image that this document writes down.This correction plate selectively is installed on the right-hand member in the left end in the path that this scanner head moves back and forth or this path.

Best, this correction graph has a kind of can being more preferably by the optional color of this scanner head scanning, and this correction graph has a kind of black color.

Best, on the direction that this scanner head moves back and forth, this correction graph has the size of 1 pixel, and on the reciprocating direction perpendicular to this scanner head, this correction graph has as the as many size of pixel by this scanner head scanning.Selectively, this correction graph has the shape with 1 * 128 pixel band.

In conjunction with the drawings, with reference to following detailed, the present invention and its many bonus can become clearer thereby can understand more completely it, and wherein identical reference symbol is represented identical or similar parts, wherein:

Figure 1A is the view of supporting paper image, and this image is divided by each pixel unit;

Figure 1B is the view that illustrates when the alignment error situation occurring when scanning the document image of Figure 1A;

Fig. 2 is the structure diagram that explanation is applied to Reciprocatory scanner of the present invention;

Fig. 3 A and 3B are the detailed views of the critical piece among Fig. 2;

Fig. 3 C is the detailed structure view of the correction plate of key diagram 2;

Fig. 4 is the block schematic of explanation according to Reciprocatory scanner of the present invention;

Fig. 5 be explanation according to the present invention, realize being used to proofreading and correct the process flow diagram of process of method of the alignment error of Reciprocatory scanner scans head;

Fig. 6 is the view at the alignment error angle of this scanner head of explanation;

Fig. 7 A is the view of explanation by the graph data that scanner head scanned with alignment error; And

Fig. 7 B is the view that this graph data behind the alignment error has been proofreaied and correct in explanation.

To the description of most preferred embodiment, can more clearly understand the purpose of foregoing invention, feature and advantage by with reference to the accompanying drawings.

Fig. 2 is the structure diagram that explanation is applied to Reciprocatory scanner of the present invention, and Fig. 3 A and 3B are the detailed views of the critical piece among Fig. 2.Fig. 3 C is the detailed structural drawing at correction plate illustrated in fig. 2.

With reference to figs. 2 to 3B, in order to scan the image that is write down on file 1, this Reciprocatory scanner is included in its scanner head 2 than a certain locational scanning sensor (not shown) of lower surface; Be used to guide this scanner head 2 to the reciprocating guide rail in the right side and the left side (guide rail) 3; Be used to driving force is provided so that make this scanner head 2 in turn and reciprocating recovery motor 4 to the right left; Be installed in and restore on the motor (carriage return motor) 4, the driving-belt (belt) 5 and its driving force that will restore motor 4 that are installed in again on the scanner head 2 simultaneously are sent to this scanner head 2; Be used to transmit this document 1 present motor (feed motor) 6 and (transporting roller) 7 rolled in transmission; And when being moved to the left side attached to the correction plate of the scanning area external position of file 1 and this scanner head 2 of Qi Dang towards this scanning sensor.

Shown in Fig. 3 C,, adhered to correction graph 9 with 1 * 128 pixel in the centre of this correction plate 8.The color of this correction graph 9 is black or other optional colors.

When this scanner head 2 is moved to the right side, this correction plate 8 can be installed in the scanning area of file 1 outer on the position of this scanning sensor.

Yet the size that the size of this correction graph 9 is set to this scanning sensor matches.Therefore, this size can change along with the standard of this product.

As shown in Figure 4, comprise above-mentioned recovery motor 4, this Reciprocatory scanner of presenting motor 6 and this scanner head 2 also comprises: input block 10, arranged many function keys therein in order to select alignment error correction function and other various functions; Storage is by the graph image of the correction graph 9 of these scanner head 2 inputs, the view data and the various storer 11 that is used for the program of correct for alignment errors of file 1; Operating unit 12, its utilizes graphic image data by 2 inputs of this scanner head to carry out the operation of the alignment error of correct scan 2; And CPU (central processing unit) 13, this CPU (central processing unit) 13 is controlled each parts according to the program that stores in storer 11.

Operational circumstances of the present invention with said structure is explained to 7B with reference to figure 5.

At first, this CPU (central processing unit) 13 is checked the correcting mode (step 1) of having selected alignment error whether.To proofread and correct immediately when making this scanner in order making, can to set the time that begins to proofread and correct according to the alignment error correction mode.Also may be set at and no matter when begin this operation of scanner and just repeat steps such as correction.

When the alignment error correction mode had been selected in judgement in the first step, this CPU (central processing unit) 13 just moved to the left side (step 2) by driving this recovery motor 4 with this scanner head 3.Therefore, the scanning sensor of this scanner head 2 just arrives the position towards correction graph 9.At this moment, this CPU (central processing unit) 13 is controlled scanning (step 3) to correction graph 9 by the scanning sensor of operation scanner head 2.Therefore, this scanning sensor scans and stores the view data of this scanning in storer 11 to correction graph 9.

After this, this CPU (central processing unit) 13 is by control operation unit 12, calculate the alignment error (step 4), and proofread and correct this alignment error (step 5) as its alignment error by moving this final pixel of each pixel unit this stored graphic image data in this storer 11 based on this first pixel.

Herein, the method that is used to calculate the alignment error of this graphic image data is represented with following equation: $\tan \mathrm{\φ}=\frac{D}{V}$ Wherein, φ is the alignment error angle, and D is the number of picture elements that has alignment error on transverse axis.In addition, V is the number of total picture element on this Z-axis.

When the timing of having finished first and last pixel of this view data, by differentiation function is applied to except first and final pixel the residue pixel on, just can realize linearity correction (step 6).Herein, as follows for realizing the applied differentiation function of this linearity correction: $\frac{d}{\mathrm{dv}}\mathrm{drop}\left(D\right)=-V\×\tan \mathrm{\φ}$

When carrying out the linearity correction of this alignment error, this CPU (central processing unit) 13 is just carried out normal scan pattern (step 7).

As mentioned above, the correction graph 9 that is applied to correction plate 8 of the present invention except available black, the also available any color that is suitable for the information processing of the graphic image data that this scanner head 2 scanned.

Yet, this correction plate 8 may be installed in the outer right-hand member of the transfer path of file 1 rather than be installed in left end.

Because the size of correction graph 9 is set to the size that is equivalent to the scanning sensor of location on scanner head 2, so its size can change with the standard of this product.

In addition, the permission limit of this alignment error may be set to such an extent that be higher than limit value within the scope of the invention,, also not have influence even this limit changes with each fabricator so.

As described above, according to the present invention, be used to proofread and correct the method and apparatus of alignment error of the scanner head of Reciprocatory scanner, available software is come the alignment error of the scanner of correct for alignment errors in allowing limit, and can cancel the unnecessary mechanically actuated that when correct for alignment errors, exists, therefore improved productive capacity.

In addition, because proofreaied and correct alignment error in this permission limit, so can obtain stable view data without any distortion by this software.

When illustrating and having narrated the most preferred embodiment of being considered of the present invention, those of ordinary skills can recognize various variations and the change that may carry out, with may replace wherein each parts with equivalent, but can not break away from actual range of the present invention.In addition,, also many changes may be done, also center range of the present invention can be do not broken away from for the particular case that is applicable to that the present invention instructs.Therefore, the present invention is not limited in realizing among the disclosed special embodiment of the contemplated best mode of the present invention, but the present invention includes all embodiment that drop within the claim scope of the present invention.

Claims (21)

1. be used to proofread and correct the method for the alignment error of Reciprocatory scanner scans head, it is characterized in that, may further comprise the steps:

When having selected the alignment error correcting mode, described scanner head is moved to towards the position of formed correction graph on correction plate;

Scan described correction graph with described scanner head;

Use the scheduled operation function calculation from the described described alignment error that is scanned the view data of figure;

At first proofread and correct the alignment error of described calculating by first and the final pixel that move described view data; And

Secondly by will predetermined correction function be applied to except described first and final pixel the residue pixel proofread and correct described alignment error.

2. the method for claim 1 is characterized in that, when making described scanner, wherein said alignment error correcting mode is set in the alignment error that is performed is successively proofreaied and correct.

3. the method for claim 1 is characterized in that, when the beginning scan operation, wherein said alignment error correcting mode is set in the alignment error that is performed is successively proofreaied and correct.

4. the method for claim 1 is characterized in that, when each bar line was carried out described scan operation, wherein said alignment error correcting mode was set in the alignment error that is performed is successively proofreaied and correct.

5. the method for claim 1 is characterized in that, described correction graph has the size of 1 * N pixel on the direction that described scanner head moves back and forth with on the reciprocating direction at vertical described scanner head respectively, and herein, N is a positive number.

6. method as claimed in claim 5 is characterized in that, on the vibration-direction perpendicular to described scanner head, the size of described correction graph is set on the Z-axis of described scanner head, has equal number of picture elements.

7. the method for claim 1 is characterized in that, described correction graph is set to that have can be by the optional color of described scanner head scanning.

8. method as claimed in claim 7 is characterized in that, described optional color is a black.

9. the method for claim 1 is characterized in that, described handling function is: $\mathrm{\φ}={\tan }^{-1}\frac{D}{V}$ Wherein, φ is an error angle, and V is a number of picture elements total on this Z-axis, and D is the alignment error value at transverse axis.

10. the method for claim 1 is characterized in that, at first aligning step, described final pixel based on the first pixel running fix on the Z-axis identical with described first pixel.

11. the method for claim 1 is characterized in that, described correction function is a differentiation function as described below: $\frac{d}{\mathrm{dv}}\mathrm{drop\; D}=-V\×\tan \mathrm{\φ}$ Wherein, D is the alignment error value of transverse axis, and V is the number of total picture element of this Z-axis, and φ is an error angle.

12. the equipment of the alignment error of a scanner head that is used to proofread and correct the Reciprocatory scanner, wherein said scanner head moves back and forth along the guide rail of setting up perpendicular to the file direction of transfer, it is characterized in that this equipment comprises:

Correction plate, this correction plate be towards described scanner head, be installed in described scanner head and carry out on this reciprocating path, and described correction plate is equipped with correction graph, and this correction graph is formed on the correction plate with definite size;

Be used to store the storer of the view data of the described figure that scans by described scanner head;

One operating unit, this unit uses predetermined handling function, calculates the alignment error of the described graphic image data that stores in described storer; And

One CPU (central processing unit), described operating unit is controlled in the to-and-fro movement of the described scanner head of this central processing unit controls, calculating the alignment error of described graphic image data, and uses predetermined correction function to proofread and correct the alignment error of described calculating.

13. equipment as claimed in claim 12 is characterized in that, described correction plate is installed on the path that described scanner head moves back and forth, and is mounted on the outer position of the scanning area of document image hereof.

14. equipment as claimed in claim 13 is characterized in that, described correction plate is installed in the left end in the path that described scanner head moves back and forth.

15. equipment as claimed in claim 13 is characterized in that, described correction plate is installed in the right-hand member in the path that described scanner head moves back and forth.

16. equipment as claimed in claim 12 is characterized in that, described correction graph has can be by the optional color of described scanner head scanning.

17. equipment as claimed in claim 16 is characterized in that, described correction graph has black color.

18. equipment as claimed in claim 12, it is characterized in that described correction graph is in the size that has 1 pixel on the direction that described scanner head moves back and forth and have as can be by the as many size of the pixel that described scanner head scans on the direction that moves back and forth perpendicular to described scanner head.

19. equipment as claimed in claim 18 is characterized in that, this correction graph has the band shape that has 1 * 128 pixel.

20. equipment as claimed in claim 12 is characterized in that, described predetermined handling function is $\mathrm{\φ}={\tan }^{-1}\frac{D}{V}$ Wherein, φ is an error angle, and V is a number of picture elements total on Z-axis, and D is the alignment error value at transverse axis.

21. equipment as claimed in claim 12 is characterized in that, described correction function is a differentiation function as described below: $\frac{d}{\mathrm{dv}}\mathrm{dropD}=-V\×\tan \mathrm{\φ}$ Wherein, D is the alignment error value of transverse axis, and V is the number of total picture element of Z-axis, and φ is an error angle.

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